Although it takes only 20 minutes, if you plan on using Vaccine Card to bypass quarantine, you could do it like 1-2 weeks before departure date, and it would be fine. There's no telling that will happen, but I believe Hawaii Safe Travels will be lifted soon, since >70% of population are fully vaccinated, and with COVID vaccine probably getting approved soon for kids 5-11, that number should go up a lot. Enough for them to drop Hawaii Safe Travels by Feb, I won't bet on it, so soon is relative, but I believe it will happen.
But you can wait to enter info, and it won't be too late 1-2 weeks before travel departure date. If you are planning on doing the Negative COVID testing to bypass quarantine, than yes, I would enter the info about 2 weeks earlier.
Have fun in Hawaii!!! I know I sure can't wait to get back!
Great3